Permanent wilting percentages based on the wilting of the upper leaves of sunflower plants were related to the 15-atmosphere percentage by the equation PWP = 0.35 + 0.833 FAP. This wilting percentage, which was lower than that based on a mean wilting condition of the plant as a whole, provided satisfactory estimates of minimum soil moisture contents under cereal crops at harvest time.
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Lehane et al. (1960) studied this question.
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